U.S. Route 89 (US 89) is a north–south United States Numbered Highway with two sections, and one former section. The southern section runs for 848 miles (1,365 km) from Flagstaff, Arizona, to the southern entrance of Yellowstone National Park. The northern section runs for 404 miles (650 km) from the northern entrance of Yellowstone National Park in Montana, ending at the Canadian border. Unnumbered roads through Yellowstone connect the two sections. Before 1992, US 89 was a Canada–Mexico, border-to-border highway that ended at Nogales, Arizona, on its southern end. Sometimes called the National Park Highway, US 89 links seven national parks across the Mountain West. In addition, 14 other national park areas, mostly national monuments, are also reachable from this backbone through the Colorado Plateau, Wasatch Mountains and northern Rockies. National Geographic named US Route 89 the No. 1 Driver's Drive in the world. From Wikipedia
